Department of Agroecology, Aarhus University, Research Centre Flakkebjerg, Slagelse, Denmark.
Department of Genetics and Bioengineering, Yeditepe University, İstanbul, Turkey.
Plant Biol (Stuttg). 2020 Sep;22(5):863-871. doi: 10.1111/plb.13123. Epub 2020 Jun 11.
Soil salinity severely affects and constrains crop production worldwide. Salinity causes osmotic and ionic stress, inhibiting gas exchange and photosynthesis, ultimately impairing plant growth and development. Arbuscular mycorrhiza (AM) have been shown to maintain light and carbon use efficiency under stress, possibly providing a tool to improve salinity tolerance of the host plants. Thus, it was hypothesized that AM will contribute to improved growth and yield under stress conditions. Wheat plants (Triticum aestivum L.) were grown with (AMF+) or without (AMF-) arbuscular mycorrhizal fungi (AMF) inoculation. Plants were subjected to salinity stress (200 mm NaCl) either at pre- or post-anthesis or at both stages. Growth and yield components, leaf chlorophyll content as well as gas exchange parameters and AMF colonization were analysed. AM plants exhibited a higher rate of net photosynthesis and stomatal conductance and lower intrinsic water use efficiency. Furthermore, AM wheat plants subjected to salinity stress at both pre-anthesis and post-anthesis maintained higher grain yield than non-AM salinity-stressed plants. These results suggest that AMF inoculation mitigates the negative effects of salinity stress by influencing carbon use efficiency and maintaining higher grain yield under stress.
土壤盐度严重影响和限制了全球的作物生产。盐度会导致渗透和离子胁迫，抑制气体交换和光合作用，最终损害植物的生长和发育。丛枝菌根（AM）已被证明在胁迫下能维持光和碳利用效率，这可能为提高宿主植物的耐盐性提供了一种手段。因此，假设 AM 将有助于在胁迫条件下提高生长和产量。小麦植株（Triticum aestivum L.）在有（AMF+）或没有（AMF-）丛枝菌根真菌（AMF）接种的情况下生长。植物在开花前或开花后或两个阶段都受到盐胁迫（200mm NaCl）。分析了生长和产量组成、叶片叶绿素含量以及气体交换参数和 AMF 定殖。AM 植株表现出更高的净光合速率和气孔导度以及更低的内在水分利用效率。此外，在开花前和开花后都受到盐胁迫的 AM 小麦植株比非 AM 盐胁迫植株保持更高的籽粒产量。这些结果表明，AMF 接种通过影响碳利用效率并在胁迫下维持更高的籽粒产量，减轻了盐胁迫的负面影响。
